When making a turn, you should signal:
Correct. Signal early enough that other drivers see and process the signal — generally at least 100 feet before in town, longer at highway speeds.
CDL Practice Question #194
Category: Combination Vehicles
Why this question matters
This question is one of 55 in our Combination Vehicles bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.